Inlaying the rosette and pickguard
Glue the rosette design onto your inlay material and cut it out with a jeweler’s saw. Use the same process to cut out the pickguard.
Using a small jeweler’s router with a base, route out the cavities for the rosette and pickguard, after tracing the outline of the inlay onto the soundboard. Glue the rosette and pickguard in place with epoxy or Cyanoacrylate glue. After the glue dries, sand the rosette and pickguard flush with the top. If you are going to put inlays into the pickguard, cut them out and route cavities for them, just like you did for the pickguard.
After the glue has dried, sand the inlays flush with the top. The top side of the soundboard is now complete.